Work holder and twisting head for forming spiral studs



March 29, 1949.

Filed Oct. 8,

V. F. ZAHODIAKIN WORK HOLDER AND TWISTING HEAD FOR FORMING SPIRAL STUDS 2 Sheets-Sheet 1 m !MMMNMMMMMMWW 45 4/ 28 ?8 hi 1 i 1 28 j 30 I N 1 [III f 3/ INVENT OR.

VlcTor'? E'ZAHQDIAKIN x ATTORNEK Patented Mar. 29, 1949 WOR'K HOIJDER TWISTINGHEAD FOR FGRMING SPIRAL STUDS Victor F. Zahodiakin, Short Hills, N. J.

Application flctobcr 8, 19.45, .SerialNo. 620,950

6 Claims. 1

invention relates to forming machines,

and more particularly to machines for :Enrmin spiral-blade studs, of the character of and for such :uses as shown my prior applications. N.

596,553, filed May 29, 1945, entitled .Fastening' devices.

In its broad aspect, the present invention icontemplates the provision of a machine lbywhich the spiral blade for a spiral-blade stud may be readily formed.

More specifically, the invention is directed to cold bending the blade to its spiral iormto a de- :2 Figure 11;is aplan o'f'the holding plunger; and Figures 12 and 1'3 are sectional views of Fig. 11

taken on "lines rl2--"l 2 "and "l 3-l 3 thereof respectively.

1n the specific embodiment of the invention illustrated in "said drawingfthe reference numeral l5 designates a fixed mounting or table here indicated as of wood for convenience, such as a plank, and to orient the samein position shown, said mounting will "be considered as horizontally disposed. Perpendicular to said mounting l5 is a two-member bearing or guiding structure of sired and precise angularity and in such .man-

ner that successively formed studs are all alike.

A further object of the invention is to .iorm the spiral after completion of theshank and head and without injury to the shank or head.

Another object of the invention is 'to provide a spiral blade the central axis whereof is precisely alined with the axis of the stud shank and head.

A yet further object of the invention is to provide a machine in which the studs are readily inserted and removed and yet firmly gripped during the twisting operation.

Other objects of the invention will appear to those skilled in the art to which it appertains as the description proceeds, both by direct recitation thereof and by inference from the context.

Referring to the accompanying drawings in which like numerals of reference indicate similar parts throughout the several views;

Figure 1 is a plan of the machine showing the twisting means in full lines in norm-a1 position or position of rest, and showing by dot and dash lines two possible positions of twist at the extremes of adjustment of the limitingstcp;

Figure 2 i an elevation of the said machine with the pressuraapplying piston and cylinder in section;

Figure 3 is an elevation of the cylinder with the sectioned parts of the supporting brackets, as

Figure 8 is a plan of the stud before the blade is twisted;

Fi ures 9 and 10 are similar plans with the blade twisted 90 and more than 90 respectively,

which the lower member F6 is axially alin'ed with the upper member ll and "of which the lower member provides "a sleeve I 8 having a peripheral flange l9 intermediate of its ends. Said lower member I 6 of the bearing structure has the end section thereof above the iiange projecting upwardly within a hole 20 through the mounting, and has its end section below the flange of adequate length 'to be readily accessible to the operator. Said upper member n is located above the mounting and provides a hub portion '21 with a peripheral flange 22 st lts lower-end juxtaposed flatwise upon mounting :l5. A cylindrical collar 23 extends coaxia'lly upward at the outer edge of the flange and is preferably an integral part with the flange. Bolts 2'4 extending through mounting l5 and. through both flanges 19, 22 secure both of said members it, I I to the mounting 15in axial alinem'ent with each other. Said two-member bearing structure is accordingly held securely in fixed position.

Both the upper and lower members I! and I5 respectively of the bearing structure have central .or axial bores of equal diameter for slidable reception of a stud holding plunger 25 more fully described hereinafter. The lower end of each bore is flared, as at 26, to assure proper entry or the plunger thereinto. The bore for the upper member I1 is within hub 2| and the upper end of said hub is flanged inwardly to constitute a top wall partly overlying or closing the upper end of the bore to provide a shoulder 21 opposed to the end of the plunger.

Below the mounting l5 and supported by intervening brackets 28 bolted at 29 to said mounting, is a vertically disposed cylinder 30 axially alined with the axis of the aforementioned bearing structure. This cylinder is closed at its bottom by a cylinder head ,3] and has a vent or other opening 32 at its upper end, whereby atmospheric pressure is admitted at all times to the interior of the upperfpart of the cylinder.

' A piston 83 is slidable in the cylinder and is actuated toward lowered or normal position by a coil spring 34 interposed between the piston and top wall of the cylinder. Fluid pressure, preferably compressed air, is utilized to raise the piston when desired. As here shown, two valves are provided in the cylinder head, one valve 35 constituting an inlet, being connected by pipe line 36 to a suitable source (not shown) of fluid pressure, and the other valve 31, constituting an outlet, being indicated as opening to the atmosphere. The rotatable members of the valves have operating arms 38 thereon and these arms are connected by a link 39 shown with a handle 40 by which the operator manipulates both valves at once, simuitaneously opening one when closing the other.

Aforementioned plunger 25 is coaxial with, fixed to and projects upwardly from the piston and through the upper wall or end of the cylinder and accordingly is slid up or down by the action of the fluid pressure in the up direction and the spring pressure in the down direction in use. The parts are proportioned so the upper end of the plunger is always outside of the cylinder and when in lowered position, by virtue of the spacing afforded by brackets 28, is readily accessible to the operator.

The upper end of said plunger is provided with a stud-receiving and positioning socket, here shown as an integral part of the plunger. For this purpose, the end margin of the plunger is shown with a horse-shoe or U-shaped wall 4| (as viewed in plan) of proper inside dimension to substantially engage around a semi-circumferential area of the stud head of the stud in course of fabrication. Likewise on the upper end of said plunger, protuberance or tongue 42 extending in a diametric direction across the middle of the end face bisecting the space symmetrically included within the U-shaped wall 4|. Said tongue is positioned and'proportioned to enter kerf of the stud being fabricated when the stud is applied to the plunger.

The stud being fabricated is shown in detail in Figures -10 and designated generally therein and in Figures 2-4 by numeral 43. Said stud is partially complete before introduction into the present machine, having already been formed with a fiat head wherein a kerf 44 extends diametrically thereof and formed with a cylindrical shank coaxial with and projecting from the head. The head and shank are accurately machined in final form and to proper dimension, and injury, deformation or disfiguration of shank or head must be avoided in the fabricating operations performed by the present machine. The stud likewise is formed to be presented to this machine, with a long, straight blade 45 substantially rec tangular in cross-section and of even width to the shank and of a thickness considerably less than the diameter of the shank, and here depicted as approximately. one-fifth of such diameter. The long dimension of the rectangular cross-section of the blade is in a direction parallel to the kerf in the head of the stud. The horse-shoe or U-shaped wall on the plunger has its opening toward the operator, which is in a direction which for convenience may be defined as toward the front of the machine, and therefore, with the plunger in its lowered or normal position, the operator may insert a stud to stand on its flat head on the end of the plunger and with the tongue of the plunger located in the kerf. The stud is centralized on the plunger by virtue of the up- 4 standing U-shaped wall and by the inter-engagement of tongue and kerf. The kerf likewise functions to orient the blade with a longitudinal thin edge toward the front of the machine.

After the operator has placed the stud in position on the plunger as shown done in Figure 2, the handle 40 is manipulated to change the valve setting, that is, to close the outlet valve and open the inlet valve so that fluid pressure is admitted and pushes the piston and plunger upward. The plunger then enters lower bearing member l6 and is steadied and guided thereby, and then enters the upper bearing member at which time the blade and then the shank of the stud are projected through a central hole in the upper end of the hub portion of that member, said hole substantially fitting around the stud to accurately guide and position the same. The peripherally projecting part of the head underlies the shoulder formed by the said end wall of the hub and the plunger proceeds to press the head against the shoulder 21 and firmly grips the head to hold it tightly in uppermost position and with adequate frictional retention to prevent rotation of the stud while the blade is twisted.

For twisting the blade, a hand-operated twisting means is illustrated for the sake of simplicity and disclosure of this feature of the invention. In its general organization this twisting means is a rotatable head 46 havng a lever 41 transverse to the axis. Said twisting head is shown in the form of an inverted cup the cylindrical wall portion of which has rotatable fit upon the outer face of the previously described collar 23 of the fixed upper bearing member II. The twisting head 46 has a top wall 48 provided with a central hole 49, and lever 41 extends over said hole. Preferably the lever is mortised into the top wall and secured by suitable means, such as bolts 50. A slot 5| is provided at the middleof the lever centrally with respect to the hole 49 of appropriate size to receive the upper end of the stud blade when the plunger and stud are raised to uppermost position. In event the stud is misplaced, and the end of the blade thereby caused to miss the slot, no harm will result as then the stud effects an emergent lifting of the twisting head and the operator is thus given notice of the misalinement.

With the stud blade projecting at its upper end into slot 5|, rotative moment applied through operation of lever 41 twists the blade through a corresponding angle. Hand grips 52 are provided on the ends of the lever for exerting the twisting force.

Limitation of amplitude of rotation in both directions is obtained by appropriate stops. As here shown, a lug 53 depends from the lever near one end thereof andfor normal or loading position this ing is brought into engagement with an upstanding part of a bracket 54 fixed-on mount: ing l5. A coil spring 551s shown for holding the lever in its normal position with the said lug in engagement with the bracket. Limitation of rotation away from normal or loading position is obtained by a horizontally disposed set screw 56 carried by another bracket 51 fixed on the mounting. Said set screw is in the plane of rotation of the lever, and by adjusting it longitudinallyits end serves to stop the rotation ofthe leverat the desired angular displacement or twist. As shown, the set screw at one extreme position will limit twist to and in its other extreme setting limits rotation to approximately 135. settings may be made as desired.

After the blade is twisted. pressure in the cylinder is released, the plunger retracts, the twisting head returns to normal loading position and the twisted stud i removed, with the machine thus ready to repeat the operations for another stud.

I claim:

1. A forming machine comprising a mounting, a two-member bearing having one member below and the other above said mounting and axially alined with a central bore for receiving a plunger, the upper bearing member having a peripheral shoulder overlying a part of the said bore and adapted to receive the head of an article under said shoulder with the article projecting from the upper end of said upper bearing member, a plunger longitudinally slidable in said bore and adapted to grip the article head between said plunger and shoulder, and means for twisting the projecting part of said article while the head thereof is gripped.

2. A forming machine comprising a mounting, a. two-member bearing having one member below and the other above said mounting and axially alined with a central bore for receiving a plunger, the upper bearing member having a peripheral shoulder overlying a part of the said bore and adapted to receive the head of an article under said shoulder with the article projecting from the upper end of said upper bearing member, a plunger longitudinally slidable in said bore and adapted to grip the article head between said plunger and shoulder, and a twisting lever transversely overlying and spaced from said upper bearing member at the part of said bearing member at which the article projects, said lever being rotatively mounted coaxially above said plunger and having a slot centrally above said plunger for receiving an end of the projecting part of said article remote from the gripped head of said article and for twisting said article along said projecting part of the article by rotating said lever.

3. A forming machine comprising a mounting, a two-member bearing having one member below and the other above said mounting and axially alined with a central bore for receiving a plunger, the upper bearing member having a peripheral shoulder overlying a part of said bore and adapted to receive the head of an article under said shoulder with the article projecting from the upper end of said upper bearing member, a plunger longitudinally slidable in said bore and adapted to grip the article head between said plunger and shoulder, and means for twisting an upwardly projecting part of said article while the head thereof is gripped, the last said means overlying said article and being displaceable in a direction axially of the plunger for emergent lifting by end engagement of the article therewith.

4. A forming machine comprising cooperating Intermediate Number fixed and movable means for gripping an article to be formed, said fixed means having a slotted shoulder through which a part of said article may project in a direction away from said movable means, and said fixed means having a collar radially beyond said shoulder, a twisting head having a cylindrical wall coaxial with and rotatable and slidable on said collar, said twisting head having a lever transverse to the axis of said cylindrical wall and having a slot transverse to and centrally intersected by the axis of said cylindrical wall, whereby said slot is engageable with the part of said article projecting from said slotted shoulder for applying twist to the article at the part thereof extending between the slots upon rotating said twisting head on said collar.

5. A forming machine comprising fixed means having a fixed article-engaging shoulder, a plunger movable toward said shoulder, said plunger having a socket opening toward said shoulder for gripping an article therein with a part of the article in the socket of said plunger and a part projecting through and from said fixed shoulder, said fixed means having a collar radially beyond said shoulder coaxial with said plunger and socket, a twisting head overlying said shoulder and collar and adapted to engage the furthest projecting end of the projecting part of the article, a cylindrical wall extending from said twisting head in rotatable engagement with said collar, and means for rotating said twisting head and thereby twisting the article in the intervening length of said article extending between said shoulder and said engaged furthest projecting end.

6. A forming machine in accordance with claim 5 wherein the plunger socket comprises a U-shaped wall at the end of said plunger admitting lateral insertion of the article into said socket.

VICTOR F. ZAHODIAKIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Sugden Sept. 13, 1870 Tucker Apr. 21, 1874 Olsen Feb, 14, 1922 Meyers Sept. 5, 1922 Cravens Feb. 11, 1930 Robarge Nov. 16, 1937 Arp Nov. 1, 1938 Le Jeune et al May 23, 1939 Loewy et a1 June 27, 1944 FOREIGN PATENTS Country Date Great Britain Jan. 21, 1878 Great Britain July 9, 1892 Germany Apr. 26, 1905 Great Britain May 17, 1892 Number 

